[Texas Fossil]

https://www.state.gov/m/ds/immunities/c9118.htm

International law requires that law enforcement authorities of the United States extend certain privileges and immunities to members of foreign diplomatic missions and consular posts. The purpose of these privileges and immunities is not to benefit individuals but to ensure the efficient and effective performance of their official missions on behalf of their governments. Most of these privileges and immunities are not absolute, and law enforcement officers retain their fundamental responsibility to protect and police the orderly conduct of persons in the United States.

[rxsid]

The Vienna Convention is (part of) international law, to which the U.S. is a signatory.

There's nothing U.S. law enforcement can do to those thugs since they are considered "diplomatic agents"